ru
ru — noun
1. a medicine used to end a pregnancy during its early stage
a medicine used to end a pregnancy during its early stage
The clinic gave Talia ru after confirming the pregnancy was still early.
give ru to + person in a clinic
Beatriz asked whether ru could be taken safely at home.
take ru in a patient question
The doctor explained that ru works best in the first weeks.
After the scan, Jin received ru with clear written instructions.
A leaflet said ru should only be used under medical care.
- mifepristone
the full medical name of the drug
- abortion pill
a broader everyday label that may refer to more than one medicine in the treatment
文法句型
take ru
give ru to + person
dose of ru
用法筆記
Usually seen in medical discussions as a short form of RU-486 or mifepristone, not in everyday conversation. This sense refers to ending an existing early pregnancy, not preventing pregnancy after sex.
常見錯誤
ru — symbol
1. the symbol for ruthenium, a hard metallic element shown in chemical formulas and
the symbol for ruthenium, a hard metallic element shown in chemical formulas and on the periodic table
James circled Ru on the periodic table before the chemistry quiz.
Ru on the periodic table
The lab label said the sample contained Ru and iron.
Ru in a materials label
Shanti measured 2 g of Ru for the classroom experiment.
A science poster compared Ru with Rh and Pd.
The teacher wrote Ru beside element 44 on the board.
- ruthenium
the full element name, used in normal speech and writing
文法句型
Ru on the periodic table
[number] g of Ru
Ru + another symbol
用法筆記
Write it with a capital R and a lower-case u. In speech, people usually say the full word 'ruthenium' instead of reading the two letters aloud.
常見錯誤
2. a specialist unit based on how a substance acts in tests on rats
a specialist unit based on how a substance acts in tests on rats
The old report measured the hormone activity in ru.
measured in ru
Putri copied 12 ru from the lab chart into her notes.
number + ru in a lab record
The bottle label listed 5 ru of enzyme activity.
Kian found ru in an older medical paper from the 1960s.
A footnote explained that ru was a unit from rat tests.
- rat unit
the full written form of the unit
文法句型
[number] ru
measured in ru
ru of + substance activity
用法筆記
This sense belongs to specialist scientific writing and is not used in everyday speech. It is written in lower-case and refers to a measurement unit, not to the chemical symbol Ru for ruthenium.